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Azure Static Web App - Pass authentication info to your linked API

As a follow-up on the presentation I did at CloudBrew about Azure Static Web Apps I want to write a series of blog posts.

If you have read my post yesterday, you know that you can link an existing API exposed through Azure API Management, an Azure App Service or Azure Container Apps to your Azure Static Web App.

When using this feature, your API is secured through Azure Static Web App and uses the configured provider.

The question that remains is

How can your API access the authentication token from Azure Static Web App?

The answer is simple, the information is passed to your API through a specific header;  the X-MS-CLIENT-PRINCIPAL header. This header contains the token Base64 encoded in the same JSON structure as when calling the .auth/me endpoint:

Let’s update our ACA API to read this header data:

If we now call our API through Azure Static Web App, we get the security token back:



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